27) VAN =

\(\angle VAN = \angle ZAN - \angle ZAV\)

\(\angle ZAV\) = 180° - \(\angle ZAB\) - \(\angle BAV\) = 180° - 40° = 140°

\(\angle ZAN\) = 180° - \(\angle ZAB\) - \(\angle BAN\) = 180° - 80° = 100°

\(\angle VAN\) = 100° - 140° = 40°

Ответ: 40°